DNA evidence
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what is shared between all species on earth
the basic structure of DNA and proteins is identical
what does the sequence of amino acids in a protein show
the evolutionary relationship between different species, once two species diverege in changes the amino acids in the long change and therefore the more similar the proteins the more closeley reelated the species
what do dna sequences in animals show
species that share a comon ancestor will have inherited that ancestors dna sequence and therefore the more alike the DNA sequence is the more closely related the species are
what is the problem with selective breediing
over many generations wild traits in animals are lost and the species becomes more domesticated and dependant of humans for survival
what is artificial selection
when humans breeed organisms that have desirable traits, increasing the liklihood of the trait occuring in the next generation